So, I took my kids for a drs visit and they did an eye exam. You know how they use letters for older kids? Well, they use pictures for really little kids like my 3 year old daughter. The nurse would point at a picture (it would be either an umbrella, apple or a house) and ask what it was. Every time, my daughter yelled "Finger!"
The nurse would explain that it was a house, umbrella or apple again. Then she'd point to it again. Once more, my daughter would yell "Finger!" This went on for about 10 minutes before the nurse flat out gave up.